The site from which an airplane takes off is the origin. The x axis points east; the y axis points straight up. The position and velocity vectors of the plane at a later time are given by
?
and 
m/s.
?
The plane is most likely
A. just touching down.
B. in level flight in the air.
C. ascending.
D. descending.
E. taking off.
Answer: D
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a.
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b.
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c.
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d.
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